Type-writer attachment.



No. 891,918. PATENTED JUNE 30, 1908.

R. D. DONOHO.

TYPE WRITER ATTACHMENT.

APPLICATION I'ILED SEPT. a. 1907.

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R. 1). DONOHO. TYPE WRITER ATTACHMENT. APPLIOATION FILED BEI'T d 1007 mmx 4 A Q ww ww w x RW R. D. DONOHO.

TYPE WRITER ATTACHMENT.

APPLICATION FILED SEPT.3.1907.

PATENTED JUNE 30, 1908.

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I PATENTED JUNE 80 1908. No 891,918 R. D DONOHO.

TYPE WRITER ATTACHMENT.

APPLICATION FILED SEPT.8.1907.

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TYPE-WRITER ATTACHJMENT.

Specification of Letters Patent.

Patented June so, 1908.

Application filed September a, 1907. Serial No. 391,153.

' To all whom it may concern:

. tion may be built directly into typewriting machines, replacingcertain of the parts.

The object of the invention is to provide a means whereby the touch ofexisting forms of machines is greatly lightened, and the operator isthereby enabled to acquire-greater speed than is possible with the samemachine without the attachment.

The invention comprises means whereby when the typewriter carriage isreturned to the position corresponding to the beginning of a line, poweris stored up in a suitable spring, in one form of the invention, orelectric actuating means may be provided, and the only work that a keyunder the control of the operator is called upon to do is to release thecorresponding typewriter keys to the action of the stored up mechanicalpower or to the action of the electric actuating devices. I

By the resent invention the keys under the controfof the operatorperform no other work than to move light latch mechanisms into the pathofa power-impelled device under the control of the prime power source,and also to unlatch the said prime power source to a movement sufficientto move a key on the regular typewriter keyboard.

The invention comprises the several structures which go to make up theattachment, or, in the case of a typewriter with the improvements builttherein, the invention comprises those parts which perform the functionsperformed by the parts constituting the attachment designed foroperating the commercial forms of ty ewriters.

' The invention will be fiilly understood from the following detaileddescription, taken in connection with the accompanying drawings formingpart of this specification, in which,

Figure 1 is a longitudinal section through the attachment and aportionof the keyboard of an ordinary typewriter of known form,

some of the parts being shown in elevation and others broken away; Fig.2 is a front elevation, with parts broken away and others in section, ofthe attachment Fig. 3 is a longitudinal section. similar to that shownin Fig. 1 but confined largely to the mechanism for operating theshifting key of the typewriter keyboard; Fig. 4 is a detail view 0 aportion of themechanism operating in conjunction with the shifting keydevices; Fig. 5 is a cross section on the line m-w of Fig. 4; and Fig. 6is a partially diagrammatic view, showing the manner of applyingelectric instead of mechanical power for actuating the keys of thecommercial form of ty ewriters.

Referring to the drawings, and more particularly to Fig. 1, there isshown a portion 1 of the frame 0 n ordinary commercial form oftypewriter, and also a number of keys 2 of such typewriter, includingthe spacing bar 3 and the end of the platen-actuating hook 4 by means ofwhich the platen of the typewriter is rotated and the carriage isreturned to its initial position corresponding to the be inning of aline.

ecured to the front of the ordinary typewriter frame is another framecomposed of side members 5 and a front connecting bar 6, with otherconnecting bars 7 and 8 and such other spacing and connecting parts asmay be necessary for the assembling of the structure. The Width of thelast-named frame may be coincident with that of the typewriter frame,and at the back of the frame there are formed lugs 9 arranged tostraddle the front of the typewriter frame, and clamp screws 10, passingthrough these lugs, serve to secure t typewriter frame. frame is mounteda bank of keys 11 upon levers 12, each of which is mounted at its rearend upon a pivot rod 13 and is there provided with a right angleextension 14 terminating in a finger 15, parallel with the lever 12, onwhich is formed an upturned projection 16. Adjacent to the end 14 ofeach lever 12 is another lever 17 mounted on a pivot rod 18 and havingits lower end short and provided with a notch 19 in which fits theprojection 16 of the finger 15. The upper end of each lever 17 is turnedat a right angle, as, indicated at 20. Above the levers 12 are otherlevers 21,parallelwith thelevers 12 and all mounted at one end upon apivot rod 22. These levers 21 extend to the back then extended upward,as shown at .23, and then to the rear, as shown at 24, and finallyterminate in a downward extension provided with a foot 26 engaging thefinger end'ot' the .'orresponding key 2, there being as many levers 21with their continuations 23, 24 and 25 and feet 26 as there are keys onthe regular keyboard. Mounted on each lever 21 between its pivotal pointand the continuation 23 is a plate 27, held to the lever by a pivotscrew 28 passing through a slot 29 in said plate. ()11 the upper edge ofthe plate is formed a lug 30, and on the upper edge of'eaeh lever 21 atashort distance from the. extension 23 is another lug 31, and betweenthese lugs extends a helical spring 32 thetendency ofwhich is tomaintain the end of the plate 27 toward the frontof the machine in anelevated position, so that a tongue 33 at the back of the plate is innormal engagement with a pin 34 projecting from the lever 21. There isalso formed on the plate 27 parallel with the lug but spaced therefrom,another lug 35, and be' tween these two lugs the extension 20 of thelever 17 normally engages. As will hereinafter appear, the plate 27moves about the pivot pin 28 against the action of the spring 32 untilits downward movementis arrested by another pin 36 projecting from thelever 21.

Ext-ending laterally across the frame is a bar 37 which, as willhereinafter appear, constit-utes the actuating bar by means of whichpower is transmitted to the levers 21 to cause them to actuate the keysof the typewriter. This bar is carried by links 38 at each end connectedto rock-arms 39 fast on a rockshaft 40, which rock-shaft has journalbearings in the sides 5 of the supplementalframe. The shaft 40 isprovided with a short rockarm 41 projecting in a direction opposite tothat of the rock-arms 39, and this rock-arm 41 is connected by a link 42to an eye 43 formed on a nut 44, which latter is mounted upon a screw orthreaded rod 45 ournaled in ears46 projecting from one end of a lever 47pivoted at 48 on a fixed portion of the frame. The other end of thelever 47 is formed into a tooth 49 in the path of the teeth of a ratchetdisk 50 mounted upon a shaft 51 suitably journaled in brackets 52projecting fromone of the sides 5 of the supplemental frame. In

line with the shaft 51 is a casing53 containing the main power spring 54for the supplemental device. One end-of the spring is secured to thecasing 53 and the other en d-to a shaft indicated in dotted lines at 55,Fig. 1, in line with the shaft 51', and this shaft 55 carries a groovedwheel 56 hollowed out to receive a ratchet whee-1.57 on the adjacent endof the shaft 51, and the grooved wheel 56 also carries'pawls 5S actuatedby springs 59 to engage the teeth of the ratchet wheel 57.

of the main frame of the attachment and are 1 The structure is such thatwhen the grooved wheel 56 is moved in the appropriate direction it willwind up the spring 54 while the pawls 58 ride idly over the teeth of theratchet wheel, but when the spring 54 is about to act it tends to movethe grooved wheel 56 in a direction .to cause the pawls 58 to act uponthe ratchet disk 57, which latter, being carried by the shaft 51, willtend to rotate the ratchet disk 50 in a clockwise direction as viewed inFig. 2. The ratchet disk 50, however, is under the. control of anescapement mechanism comprising an arm 60 having a fixed tooth 61 and apivoted tooth 62 sufficiently out of alinement so that when this arm ismoved in the )lane of the axis of the disk 50 the fixed tootli 61 andpivotedtooth 62 will be brought alternately into the path of the'teethon the ratchet disk 50. The arm 60 is mounted upon a pivot shaft 63supported in bearings 64 adjustably mounted in legs 65 depending fromand forming parts of the bracket supporting the spring drum and adjacentstructures. Projecting from the shaft 63 on the side oppositeto itsconnection with the arm 60 is another arm 66 which, in turn, is connected by a link 67 to a. rock-arm 68 on the end 69 of a shaft 70journaled in and projecting through the supplemental frame, while theend 69 extends beyond one of the ends of. said frameand is alsojournaled in a bracket 71 secured to one of the ends 5 of thesupplemental frame. The shaft 70, between the two sides of thesupplemental frame, is provided with short rock-arms 72 arranged atright angles to the arm 68, and these arms 72 are connected by links 73to a bar 74 eX- tending under and in the path of all the key levers 12,so that when any one of the key levers is depressed the shaft 70 isrocked upon its axis and actuates the escapement arm 60. A spring 75,connecting the arm 66.

to a fixed portion of the frame, tends to maintain the escapement arm 60in normal position.

Now, whenever a key lever 12 is depressed the escapement arm 60 is movedso that the tooth 61 is carried out of'the path of a tooth on the disk50 and this disk is permitted to rotate until the next tooth engages thepivoted tooth 62 but, the latter being pivoted, the disk 50 is allowedto rotate to a sufficient extent to move the lever 47 through a suitablerange toactuate the. bar 37. The tooth 62 is ultimately stopped byengaging a suitable shoulder on the arm 60, and when the parts arereturned to their normal position the tooth 61 will then be in the pathof the tooth last engaged by the tooth 62 and the latter being moved outof the range of the teeth of the disk 50 will be forced back to itsoriginal position by a spring, not shown in the drawings but which iscommonly used in this type of escapement mechanism.

When a key 11 was depressed as described tial position,

the keys 11 need not be greater than one- '26 to actuate the typewriterkey 2 with 27 is carried to a considerable distance below a bar 78connected to a sliding member 79 the type bars of the typewriter allreceive like impulses, whiclrwmay be regulated by the plate 27 until itsfront end was in the roviding the spring 54 with a tension regupath ofthe bar 37. Now, when the bar 37 is j ating device such as is common intypedepressed in the manner just described it en- I writers and whichneed be neither shown nor gages the plate 27 and, forcing the samedescribed herein. down against the pin 36, moves the lever 21 It is tobe noted that when a key 11 is deabout its pivot and thereby causes thefoot pressed the typewriter keys are actuated during a certain brieftime period, and this whether the key 11 is immediately released orwhether it be held in the depressed position. Thus the action is quick,positive and certain, and even though the operator be sluggish inoperating the keys, still the parts ass through the cycle of operationsand reurn to a position ready for the depression of the next key withina positive time period of short duration. 2

In order to return the levers 21 to their normal positions there isplaced under them a bar 84 hung at each end on rods 85 attached to theends of short rock-arms 86 on a rockand the key. lever 12 moved aboutits pivot the lever 17Was likewise moved to project which it is inengagement. When the lever 21 is depressed the upper end of the lever 17remains stationary, and, therefore, the plate it. The bar 37 continuesthis downward l movement until the tooth 49 escapes from the tooth ofthe ratchet disk 50 with which it j was engaged,-flhen the bar 37 andthe parts connected thereto may be returned to their normal osition by asuitable spring 76. Should the key be held down longer than the timeperiod during which the operation described takes place, the lug 35 willengage underthe angle portion 20 of the lever 17 until the key isreleased and the lever 17 returns to its normal position. This will not,however, prevent the typewriter key and the lever 21 from returning totheir normal position. The spacing bar and keys are all oper ated in themanner just described by the supplemen'tal device, which has a bank ofkeys and'a space bar corresponding to those of an ordinary typewriter,and the operation continues until a line is completed.

Now,.when the o erator grasps the hook 4 in order to return t e tyewriter carriage to the initialposition, the t umb of the operator maygrasp another hook 77 on one-end .of

mental frame, and this rock-shaft carries another arm 88 having its endin the path of a spring 89 carried by an adjusting screw 90' tappedthrough a lug 91 on the supplemental frame. The screw 90 carries a nutor plate 92 between which and the end of the arm 88 the spring isconfined, so that when the screw 90 is adjusted to or from the arm 88the tension of the spring is regulated. This spring tends at all timesto maintain the levers 21 in the uppermost position, which position isimited by a fixed bar 93 extending across 'the machine between the lugs31 and the extensions 23 of the levers 21.

In Figs. 3, 4 and 5is shown a structure by .;means of which the carriagemay be shifted for upper or lower case letters. In this structure thereis shown a shifting key 11 fast ona key lever 12 actuating another lever17 which, in turn, controls the latch plate 27 on the lever 21, and thislever 21 has an extension 25 provided with a foot 26 engaging theshifting key 2 of the regular typewriter. Here, again, the lever 21 isunder the control of the actuating bar 37 and is returned by a separatespring 84, but the escapement bar 7 4 is not engaged directly by thisshifting lever 12, since in the particular structure shown the lever 12is elevated above the bar 74 or may be otherwise remountedon a rod80fast in the sides of the supplemental frame, and this slidin member mayhave a spline 81 engaging in a Iongitudinalgroove inzthe bar 80 so thatthe hook 77 will maintainits osition with relation to the hook 4.Extending from the sliding member 79 is a cord or strap 82 passing overa p ulley'83 and around the grooved Wheel 56.

he hooks4 and 77 are arranged to travel coincidently, and the hook 77may even be dispensed with and the part 78 connected directly to'thetypewriter carriage. When. the typewriter carriage is returned to itsinithus winding up the spring of the typewriter, the power spring 54 islikewise wound up.

The range of movement of an ordinary typewriter key is a proximatelyfive-eighths of an inch, while t e range of movement of downwardmovement without engaging said bar.

The shift key lever 12 is located to one or both sides 5 of the suplemental since the only work frame, and pivoted to the side mem er ofthe do is to shift the light frame is an angle dog 94 having its pivotedement arm 60, it will end normall parallel with the lever 12and e seenthat the touc of the typewriter is its angle en in engagement with thebar 74. lightened to a very marked degree and the Pivoted upon the lever12 is another dog 95 labor put upon the fingers of the operator isnormally under the control of a spring 96 and provided with an end tooth97 engaging adjacent eighth of an inch, and

that these keys have to plate27 and the esca very materially reduced.Besides all this, 1

lated thereto so as to be capable of the full over the angle of the dog94. A pin 98, projecting from the side 5 of the frame, is arranged inthe path of this dog 95 so as to engage a cam surface 99 thereon. Whenthe shift lever 12 is depressed the dog 95, engaging the angle of thedog 94, will move the latter about its pivot and depress the bar 74,thus operating the escapement, but before the lever 12 has reached thelower limit of its travel the pin 98 engages the cam edge 99 and throwsthe tooth 97 out of engagement with the dog 94, and the bar 74 istherefore free to return to its normal position. Thus the shift key maybe held down for an indefinite time, while the escapement bar 74 is freeto be operated by the other keys as described.

Formed on the bar 12 is a forked finger 100 engaging a lug 101 near thepivotal end. of a bar 102, the other end of which is formed into a tooth103 (see Fig. 5), and this tooth is in the path of the inclined face 104of another tooth 105 projecting from a lever 106, best shown in Fig. 4.This lever 106 is carried by a plate 107 fast on one side member 5 ofthe supplemental frame, and the tooth 105 extends through an opening 108in said frame, bein normally impelled to project through sai opening bya spring 109. On the free end of the lever 106 there is another tooth110 extending through an opening 111 in the plate 107, and this tooth110 is so located that when projected it will engage over the upper edgeof the lever 21. when the latter is in the depressed position. Theresult of this is that when the tooth 110 engages over the lever'21 inits depressed position this lever is held in such position, even thoughthe bar 37 be elevated from engagement therewith. Thus the shifting keymay be held in the depressed position while as many of the other keys asdesired are operated.

When the shifting key lever 12 is depressed the tooth 103 is carriedbelow the tooth 104 and the lever 106 is therefore free to be moved bythe spring 109 and the tooth 110 is projected, but not until the lever21 has been depressed. When the shifting key lever 12 is released theparts all return to their normal position and the tooth 103, engagingthe tooth 104, will cause the lever 106 to move against the action ofthe spring 109 and the tooth 110 is withdrawn from above the lever 21and the latter then returns to its normal position.

Referring, now, to Fig. 6, there is shown a means whereby electricenergy may replace the spring 54. In this case each key lever 12 carriesa pivoted dog 112 normally under the control .of a s ring 113, and thisdog has a tooth 114 norma ly en aging over the upper edge of alongitudinal ar 115, so that when any one of the key levers is depressedthe bar .bar.

the bar 115 the contact terminal 122 isboard.

115 will also be carried downward. Extending across the device betweenthe end members 5 of the frame is another fixed bar 116 acting link 118to an arm 119 on a rock-shaft 120,

which rock-shaft is provided with another arm 121 carrying a contactterminal 122 and is under the control of a sprin 123 fast on anadjusting screw 124 mounted in a bracket 125 carried by the frame of themachine. Opposed to the contact 122 is another electric contact terminal126 under the control of a spring 127 fast to an adjusting nut 128mounted in the bracket 125.

A source of current, indicated by a battery 129, is connected on oneside by a conductor 130 to the rock-shaft 120 and so to the circuitterminal 122. The other side of the battery is connected by a conductor131 to one terminal of an electro-magnet 132, the other terminal ofwhich is connected by a conductor 133 to the contact terminal 126. Inthis case the actuating bar 37, which is only conventionally shown inthe figure in relation to the lever 21, is connected by a link 134 to arockarm 135 on a rock-shaft 136, which shaft has another arm 137terminating in "an armature 138 in operative relation to the magnet 132.

-Now, when a key lever 12 is de ressed the bar 115 is likewise depressedunt1 the tooth 114 is moved out of engagement with said During thedownwardmovement of brought into engagement with the contact terminal126, first stretching the spring 123, and after contact is madestretching the s ring 127. As soon as the circuit is comp eted themagnet 132 is energized and the armature 138 IS attracted, thus movingthe bar 37 and operating the lever 21 to depress its apprdpriate key onthe typewriter keys soon as the bar 115 escapes from the tooth 114 thesprings 123 and 127 return the bars to their normal position, thusbreaking the circuit and deenergizing the magnet 132 and permitting thereturn of the actuating bar 37 and lever 21. This occurs whether the keylever 12 be .held in the depressed position or whether it be immediatelyreleased after having been once depressed, so that the typewriter keysare actuated within a definite, short time period irrespective of thetime period during which the key lever 12 is held in the depressedposition.

The'bar 93 is made adjustable in a vertical direction by means of setscrews 139 passing through lugs 140 on the end plates 5 of theframework.

When the machine is assembled, there is threaded upon the bars 7 and 8,and also upon the pivot bars for the levers 12, 17 and 21, a series ofspacing plates 141, there being a plate between each lever or set ofcoacting levers, while washers 1 12 upon the rods 7 and 8 or whereverelse they may be needed, serve to space the plates 141 without bringingundue pressure to bear upon the levers. When the parts are allassembled, the rods 7 and 8 are screwed into threaded sockets 143 faston one of the side members 5 of the frame, while the other ends of therods 7 and 8 may be formed as shown at 144 for the reception of ascrewdriver or other suitable tool, and collars 145 u on these rodsengaging the outer face of t e corresponding side member of the frameserve to clamp the whole structure firmly together. By this means, theplates 141 serve to prevent side movement of the levers and the wholestructure is rendered true and solid. l/Vhen the device is built into atypewriter instead of being used simply as an attachment for atypewrlter already uilt, the plates 27 are mounted directlyon the stubends of the type key levers of the ordinary typewriter, the keys 11 thenreplacing the ordinary keyboard of the typewriter and the stud ends ofthe key levers replacing the levers 21.

I claim 1. A typewriter attachment comprising a lever for each type keyof a typewriter, power actuated ropelling means common to all thelevers, a ey lever for each type actuating lever, a sliding pivotedspring-controlled plate u on each type actuating lever, and another everunder the control of the key lever and engaging the sliding plate.

2. A typewriter attachment comprising a lever for each type key of atypewriter, a power actuated ropelling means common to all the levers, aey lever for each'type actuating lever, said key lever having an angleextension beyond its ivot sliding spring-control ed p ate upon each typeactuating lever, and another pivoted lever having one end engaging thesliding plate and the other end engaged by the angle extension of thekey lever.

3. A typewriter attachment comprising a lever for each type key of atypewriter, a

power actuated ropelling means common to all the levers, ey levers, onefor each type actuating lever, a pivoted plate carried upon each keyactuating lever and movable with relation to its pivot point into andout of the path of the power actuated r0 elling means, another levermovable by the ey lever to propel the plate into and out of activeposition, and connections between the lastnamed lever and the slidingplate, whereby oint, a pivoted .position while a key lever is depressed.

4. In a typewriter attachment, a propelling spring, a pawl-and-ratchetescapement therefor, key levers, a common connection between the latterand the pawl-and-ratchet escapement, other levers, one for each t pe keyof a typewriter, a common propel ing means for the key actuating levers,connections between said common pro elling means and the ratchet wheelunder t 1e control of the spring, and movable members, one carried byeach type actuating lever and under the control of the key lever,whereby said movable member is placed in operative relation to theactuating means each time its respective key lever is depressed.

5. In a typewriter attachment, a source of 1power, levers arranged toengage the type eys of a typewriter, a common actuating means for saidlevers, a ratchet wheel under the control of the source ofpower, a levermovable by the teeth of the ratchet wheel, connections between saidlever and the common actuating means for the ty e key actuatin levers,and means carried by each of the rst-named levers and movable into andout of the path of the common actuating means. 6. In a typewriterattachment, a source of ower, levers arranged to engage the type eys ofa typewriter, a common actuating means for said levers, a ratchet wheelunder the control of the source of power, a lever movable by the teethof the ratchet Wheel, connections between said lever and the commonactuating means for the type key actu ating levers, adjusting meansbetween said connections and the ever engaged by the teeth of theratchet wheel, whereby the effect ive movement of said lever may beadjusted at will, and means carried by each of the firstnamed levers andmovable into and out of the path of the common actuating means. 7. In atypewriter attachment,.a source of power, levers arranged to engage thetype eys of a typewriter, a common actuating means for said levers, aratchet wheel under the control of the source of power, a lever movableby the teeth of the ratchet wheel, connections between said lever andthe common actuating means for the type key actuating levers, adjustinmeans between said connections and the ever engaged by the teeth of theratchet wheel, whereby the effective movement of said lever may beadjusted .at will, a screw extending longitudinally of said lever, a nutcarried by said screw and coupled to said connecting means, whereby thenut may be adjusted longitudinall with reference to the pivotal point ofthe lever and the effective movement of the latter be adjusted, andmeans carried by tions movable coincidently with the carriage of thetypewriter, and a rewinding hook located adjacent to the carriage hookof the typewriter within reach of the hand of theoperator when graspingthe typewriter hook.

10. In a typewriter attachment, a key lever, operating connectionstherefrom to the shift key of an ordinary typewriter, and a latch forlocking the shift key in the depressed position, said latch being underthe control of the key lever.

11. In a typewriter attachment, a key lever, operating connectionstherefrom to the shift key of an ordinary typewriter, a latch comprisinga spring-controlled lever having an extension movable into the path ofthe connections between the key lever and the shift key of thetypewriter, and another lever movable with the key lever out of the pathof said spring-controlled lever when the key lever is depressed andacting to move the spring-controlled lever out of the path of saidconnections when the key lever is returned to its normal position.

12. In a typewriter attachment, a key lever, an actuating levercontrolled thereby and arranged to engage the shift key of a typewriter,a source of power, an actuating means for the shift key actuating lever,a connection under the control. of the key lever for releasing thesource of power to move the lever controlling the shift key, and

a latch between the key lever and the escapment connections, whereby thelatter are actuated and then permitted to return to normal position asthe key lever is depressed.

13. In a typewriter attachment, a key lever, an actuating levercontrolled thereby and arranged to engage the shift key of a typewriter,a source of power, an actuating means for the shift. key actuatinglever, a

connection under the control of the key lever for releasing the sourceof power to move the lever controlling the shift key, and a latchbetween the key lever and the escapement connections, comprising anangle lever carvried by a fixed portion of the structure, a

spring actuated dog carried by the key lever and engaging said anglelever, and means for throwing off said dog before the key lever reachesthe lower limit of its travel.

14. In a typewriter attachment, levers arranged to engage the key leversof a typewriter, and means for returning said actuating levers to theirnormal position, comprising a bar extending beneath all the levers, arock shaft, connections between the latter and the bar, an arm on therock shaft, and an adjustable spring engaging said arm and tending tolift the bar.

15. A series of operating levers, in combination with a power-actuatedpropelling means common to all the levers, a key lever for each of thefirst-named levers, a sliding pivoted spring-controlled plate betweeneach key lever and each of the said first-named levers, and anotherlever under the control of a respective key lever and engaging thesliding plate.

16. A series of key levers, and connections between thesame and typelevers, spacing plates between each key lever, supporting rods for saidspacing plates, end frames through which the rods extend, and screwsockets or nuts carried by said end plates and into which the rods arethreaded.

17. A series of key levers, and connections between the same and typelevers, spacing plates spacing each key lever and its cooperating partsfrom the next adjacent key lever and cooperating parts, rods upon whichthe plates are carried, each rod having screw threads at one end and ashoulder at the other end, nuts for receiving the threaded ends of therods and carried by end frames,

and spacing washers on the rods between the plates.

In testimony that I claim the foregoing as my own, I have hereto aflixedmy signature in the presence of two witnesses.

RQBERT D. DONOHO.

